Overview
The CG DAF™ Radial Flow system is a circular dissolved air flotation unit with centre-feed radial hydraulics achieving efficient flotation with high throughput per unit of plan area. Feed water enters at the centre and flows radially outward, providing a longer effective flotation path than a rectangular tank of equivalent area and eliminating hydraulic dead zones found in rectangular designs. The rotating skimmer arm continuously removes floating sludge from the entire surface while a conical floor directs settled solids to the centre drain. The radial flow configuration is particularly robust under variable incoming flows and is most cost-effective for large-volume applications up to 8,000 m³/day per unit.
Working Principle
Chemically conditioned wastewater enters the centre of the circular tank through a submerged feed pipe and distribution baffle. Recycle water supersaturated with dissolved air at 5–7 bar is released through micro-pore nozzles at the centre, generating micro-bubbles throughout the contact zone. As flow moves radially outward, velocity decreases progressively (cross-sectional area increases with radius), providing excellent conditions for gentle flotation. A motor-driven rotating skimmer arm sweeps the entire surface continuously, moving float sludge to a peripheral collection trough. Clarified effluent collects at the outer perimeter weir. Heavy settled solids collect on the conical floor and drain periodically.
Key Technical Features
- Circular radial-flow — no dead corners or short-circuiting
- Highest hydraulic loading per m² of any DAF configuration
- Rotating skimmer arm — uniform sludge removal from full surface
- Conical floor — gravity collection of settled solids
- Peripheral effluent weir — uniform hydraulic take-off
- FOG removal: >90%, SS removal: >85%
- Most economical for high flow rates (200–8,000 m³/day)
- RCC or steel tank construction
- PLC automated control
Design Parameters
| Parameter | Value |
|---|---|
| Flow Range | 200–8,000 m³/day |
| Tank Shape | Circular |
| FOG Removal | >90% |
| SS Removal | >85% |
| Recycle Ratio | 15–25% |
| Operating Pressure | 5–7 bar |
| Skimmer | Rotating Arm |
Applications
- Large-volume food and beverage processing
- Sugar mill clarification
- Municipal water and wastewater
- Large beverage production facilities
- Paper and board mill white water
- Drinking water turbidity removal
Advantages
- Lowest civil cost per m³ for large flows
- No dead corners — full tank utilisation
- Rotating arm skimmer — minimal maintenance
- Conical floor eliminates bottom sludge accumulation
- Handles up to 8,000 m³/day per unit
- High robustness under variable loading
Frequently Asked Questions
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